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系统 概念 : 21 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 4 |
| Economy | 1 |
| Electronics | 5 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Information technology | 2 |
| Space | 4 |
| Steel production | 1 |
| Technology | 2 |
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